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mustry

  • 2 years ago

prov that sin3A=?

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  1. hba
    • 2 years ago
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    This is not a proof ?

  2. hba
    • 2 years ago
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    sin3A= something which we have to prove ?

  3. hba
    • 2 years ago
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    @mustry Please reply ?

  4. ajprincess
    • 2 years ago
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    Prove sin3A=? sin3A=sin(A+2A) use sin(A+B)=sinAcosB+cosAsinB sin2A=2sinAcosA

  5. mustry
    • 2 years ago
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    good

  6. mustry
    • 2 years ago
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    actually u know

  7. mustry
    • 2 years ago
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    no ur suppose to expand it

  8. mustry
    • 2 years ago
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    sin(2A+A)=sin2AcosA+cos2AsinA

  9. mustry
    • 2 years ago
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    BUT cos2A=cos^A+sin^A

  10. ajprincess
    • 2 years ago
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    cos2A=cos^2A-sin^2A =1-2sin^2A =2cos^2A-1

  11. mustry
    • 2 years ago
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    OKAY put it in the equestn

  12. mustry
    • 2 years ago
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    ur r8

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